જો $u = x{y^2}{\tan ^{ - 1}}\left( {\frac{y}{x}} \right)$ હોય,તો $x{u_x} + y{u_y} = $

  • A
    $2u$
  • B
    $u$
  • C
    $3u$
  • D
    $u/3$

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જો $z = \frac{(x^4 + y^4)^{1/3}}{(x^3 + y^3)^{1/4}}$ હોય,તો $x\frac{\partial z}{\partial x} + y\frac{\partial z}{\partial y} = $

જો $z=\log (\tan x+\tan y)$ હોય,તો $(\sin 2 x) \frac{\partial z}{\partial x}+(\sin 2 y) \frac{\partial z}{\partial y}$ ની કિંમત શોધો.

જો $z=\sec (y-ax)+\tan (y+ax)$ હોય,તો $\frac{\partial^2 z}{\partial x^2}-a^2 \frac{\partial^2 z}{\partial y^2}$ ની કિંમત શોધો.

જો $u = \tan^{-1}(\frac{y}{x})$ હોય,તો આઈલરના પ્રમેય મુજબ $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ ની કિંમત શું થાય?

જો $u=\log \left(x^3+y^3+z^3-3 x y z\right)$ હોય,તો $(x+y+z)(u_x+u_y+u_z)$ ની કિંમત શોધો.

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